/** * @file llimagetga.cpp * * $LicenseInfo:firstyear=2001&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ #include "linden_common.h" #include "llimagetga.h" #include "lldir.h" #include "llerror.h" #include "llmath.h" #include "llpointer.h" // For expanding 5-bit pixel values to 8-bit with best rounding // static const U8 LLImageTGA::s5to8bits[32] = { 0, 8, 16, 25, 33, 41, 49, 58, 66, 74, 82, 90, 99, 107, 115, 123, 132, 140, 148, 156, 165, 173, 181, 189, 197, 206, 214, 222, 230, 239, 247, 255 }; inline void LLImageTGA::decodeTruecolorPixel15( U8* dst, const U8* src ) { // We expand 5 bit data to 8 bit sample width. // The format of the 16-bit (LSB first) input word is // xRRRRRGGGGGBBBBB U32 t = U32(src[0]) + (U32(src[1]) << 8); dst[2] = s5to8bits[t & 0x1F]; // blue t >>= 5; dst[1] = s5to8bits[t & 0x1F]; // green t >>= 5; dst[0] = s5to8bits[t & 0x1F]; // red } LLImageTGA::LLImageTGA() : LLImageFormatted(IMG_CODEC_TGA), mColorMap( NULL ), mColorMapStart( 0 ), mColorMapLength( 0 ), mColorMapBytesPerEntry( 0 ), mIs15Bit( FALSE ), mAttributeBits(0), mColorMapDepth(0), mColorMapIndexHi(0), mColorMapIndexLo(0), mColorMapLengthHi(0), mColorMapLengthLo(0), mColorMapType(0), mDataOffset(0), mHeightHi(0), mHeightLo(0), mIDLength(0), mImageType(0), mInterleave(0), mOriginRightBit(0), mOriginTopBit(0), mPixelSize(0), mWidthHi(0), mWidthLo(0), mXOffsetHi(0), mXOffsetLo(0), mYOffsetHi(0), mYOffsetLo(0) { } LLImageTGA::LLImageTGA(const std::string& file_name) : LLImageFormatted(IMG_CODEC_TGA), mColorMap( NULL ), mColorMapStart( 0 ), mColorMapLength( 0 ), mColorMapBytesPerEntry( 0 ), mIs15Bit( FALSE ) { loadFile(file_name); } LLImageTGA::~LLImageTGA() { delete [] mColorMap; } BOOL LLImageTGA::updateData() { resetLastError(); // Check to make sure that this instance has been initialized with data if (!getData() || (0 == getDataSize())) { setLastError("LLImageTGA uninitialized"); return FALSE; } // Pull image information from the header... U8 flags; U8 junk[256]; /**************************************************************************** ** ** For more information about the original Truevision TGA(tm) file format, ** or for additional information about the new extensions to the ** Truevision TGA file, refer to the "Truevision TGA File Format ** Specification Version 2.0" available from Truevision or your ** Truevision dealer. ** ** FILE STRUCTURE FOR THE ORIGINAL TRUEVISION TGA FILE ** FIELD 1 : NUMBER OF CHARACTERS IN ID FIELD (1 BYTES) ** FIELD 2 : COLOR MAP TYPE (1 BYTES) ** FIELD 3 : IMAGE TYPE CODE (1 BYTES) ** = 0 NO IMAGE DATA INCLUDED ** = 1 UNCOMPRESSED, COLOR-MAPPED IMAGE ** = 2 UNCOMPRESSED, TRUE-COLOR IMAGE ** = 3 UNCOMPRESSED, BLACK AND WHITE IMAGE ** = 9 RUN-LENGTH ENCODED COLOR-MAPPED IMAGE ** = 10 RUN-LENGTH ENCODED TRUE-COLOR IMAGE ** = 11 RUN-LENGTH ENCODED BLACK AND WHITE IMAGE ** FIELD 4 : COLOR MAP SPECIFICATION (5 BYTES) ** 4.1 : COLOR MAP ORIGIN (2 BYTES) ** 4.2 : COLOR MAP LENGTH (2 BYTES) ** 4.3 : COLOR MAP ENTRY SIZE (2 BYTES) ** FIELD 5 : IMAGE SPECIFICATION (10 BYTES) ** 5.1 : X-ORIGIN OF IMAGE (2 BYTES) ** 5.2 : Y-ORIGIN OF IMAGE (2 BYTES) ** 5.3 : WIDTH OF IMAGE (2 BYTES) ** 5.4 : HEIGHT OF IMAGE (2 BYTES) ** 5.5 : IMAGE PIXEL SIZE (1 BYTE) ** 5.6 : IMAGE DESCRIPTOR BYTE (1 BYTE) ** FIELD 6 : IMAGE ID FIELD (LENGTH SPECIFIED BY FIELD 1) ** FIELD 7 : COLOR MAP DATA (BIT WIDTH SPECIFIED BY FIELD 4.3 AND ** NUMBER OF COLOR MAP ENTRIES SPECIFIED IN FIELD 4.2) ** FIELD 8 : IMAGE DATA FIELD (WIDTH AND HEIGHT SPECIFIED IN ** FIELD 5.3 AND 5.4) ****************************************************************************/ mDataOffset = 0; mIDLength = *(getData()+mDataOffset++); mColorMapType = *(getData()+mDataOffset++); mImageType = *(getData()+mDataOffset++); mColorMapIndexLo = *(getData()+mDataOffset++); mColorMapIndexHi = *(getData()+mDataOffset++); mColorMapLengthLo = *(getData()+mDataOffset++); mColorMapLengthHi = *(getData()+mDataOffset++); mColorMapDepth = *(getData()+mDataOffset++); mXOffsetLo = *(getData()+mDataOffset++); mXOffsetHi = *(getData()+mDataOffset++); mYOffsetLo = *(getData()+mDataOffset++); mYOffsetHi = *(getData()+mDataOffset++); mWidthLo = *(getData()+mDataOffset++); mWidthHi = *(getData()+mDataOffset++); mHeightLo = *(getData()+mDataOffset++); mHeightHi = *(getData()+mDataOffset++); mPixelSize = *(getData()+mDataOffset++); flags = *(getData()+mDataOffset++); mAttributeBits = flags & 0xf; mOriginRightBit = (flags & 0x10) >> 4; mOriginTopBit = (flags & 0x20) >> 5; mInterleave = (flags & 0xc0) >> 6; switch( mImageType ) { case 0: // No image data included in file setLastError("Unable to load file. TGA file contains no image data."); return FALSE; case 1: // Colormapped uncompressed if( 8 != mPixelSize ) { setLastError("Unable to load file. Colormapped images must have 8 bits per pixel."); return FALSE; } break; case 2: // Truecolor uncompressed break; case 3: // Monochrome uncompressed if( 8 != mPixelSize ) { setLastError("Unable to load file. Monochrome images must have 8 bits per pixel."); return FALSE; } break; case 9: // Colormapped, RLE break; case 10: // Truecolor, RLE break; case 11: // Monochrome, RLE if( 8 != mPixelSize ) { setLastError("Unable to load file. Monochrome images must have 8 bits per pixel."); return FALSE; } break; default: setLastError("Unable to load file. Unrecoginzed TGA image type."); return FALSE; } // discard the ID field, if any if (mIDLength) { memcpy(junk, getData()+mDataOffset, mIDLength); /* Flawfinder: ignore */ mDataOffset += mIDLength; } // check to see if there's a colormap since even rgb files can have them S32 color_map_bytes = 0; if( (1 == mColorMapType) && (mColorMapDepth > 0) ) { mColorMapStart = (S32(mColorMapIndexHi) << 8) + mColorMapIndexLo; mColorMapLength = (S32(mColorMapLengthHi) << 8) + mColorMapLengthLo; if( mColorMapDepth > 24 ) { mColorMapBytesPerEntry = 4; } else if( mColorMapDepth > 16 ) { mColorMapBytesPerEntry = 3; } else if( mColorMapDepth > 8 ) { mColorMapBytesPerEntry = 2; } else { mColorMapBytesPerEntry = 1; } color_map_bytes = mColorMapLength * mColorMapBytesPerEntry; // Note: although it's legal for TGA files to have color maps and not use them // (some programs actually do this and use the color map for other ends), we'll // only allocate memory for one if _we_ intend to use it. if ( (1 == mImageType) || (9 == mImageType) ) { mColorMap = new U8[ color_map_bytes ]; if (!mColorMap) { llerrs << "Out of Memory in BOOL LLImageTGA::updateData()" << llendl; return FALSE; } memcpy( mColorMap, getData() + mDataOffset, color_map_bytes ); /* Flawfinder: ignore */ } mDataOffset += color_map_bytes; } // heights are read as bytes to prevent endian problems S32 height = (S32(mHeightHi) << 8) + mHeightLo; S32 width = (S32(mWidthHi) << 8) + mWidthLo; // make sure that it's a pixel format that we understand S32 bits_per_pixel; if( mColorMap ) { bits_per_pixel = mColorMapDepth; } else { bits_per_pixel = mPixelSize; } S32 components; switch(bits_per_pixel) { case 24: components = 3; break; case 32: components = 4; // Don't enforce this. ACDSee doesn't bother to set the attributes bits correctly. Arrgh! // if( mAttributeBits != 8 ) // { // setLastError("Unable to load file. 32 bit TGA image does not have 8 bits of alpha."); // return FALSE; // } mAttributeBits = 8; break; case 15: case 16: components = 3; mIs15Bit = TRUE; // 16th bit is used for Targa hardware interupts and is ignored. break; case 8: components = 1; break; default: setLastError("Unable to load file. Unknown pixel size."); return FALSE; } setSize(width, height, components); return TRUE; } BOOL LLImageTGA::decode(LLImageRaw* raw_image, F32 decode_time) { llassert_always(raw_image); // Check to make sure that this instance has been initialized with data if (!getData() || (0 == getDataSize())) { setLastError("LLImageTGA trying to decode an image with no data!"); return FALSE; } // Copy everything after the header. raw_image->resize(getWidth(), getHeight(), getComponents()); if( (getComponents() != 1) && (getComponents() != 3) && (getComponents() != 4) ) { setLastError("TGA images with a number of components other than 1, 3, and 4 are not supported."); return FALSE; } if( mOriginRightBit ) { setLastError("TGA images with origin on right side are not supported."); return FALSE; } BOOL flipped = (mOriginTopBit != 0); BOOL rle_compressed = ((mImageType & 0x08) != 0); if( mColorMap ) { return decodeColorMap( raw_image, rle_compressed, flipped ); } else { return decodeTruecolor( raw_image, rle_compressed, flipped ); } } BOOL LLImageTGA::decodeTruecolor( LLImageRaw* raw_image, BOOL rle, BOOL flipped ) { BOOL success = FALSE; BOOL alpha_opaque = FALSE; if( rle ) { switch( getComponents() ) { case 1: success = decodeTruecolorRle8( raw_image ); break; case 3: if( mIs15Bit ) { success = decodeTruecolorRle15( raw_image ); } else { success = decodeTruecolorRle24( raw_image ); } break; case 4: success = decodeTruecolorRle32( raw_image, alpha_opaque ); if (alpha_opaque) { // alpha was entirely opaque // convert to 24 bit image LLPointer<LLImageRaw> compacted_image = new LLImageRaw(raw_image->getWidth(), raw_image->getHeight(), 3); compacted_image->copy(raw_image); raw_image->resize(raw_image->getWidth(), raw_image->getHeight(), 3); raw_image->copy(compacted_image); } break; } } else { BOOL alpha_opaque; success = decodeTruecolorNonRle( raw_image, alpha_opaque ); if (alpha_opaque && raw_image->getComponents() == 4) { // alpha was entirely opaque // convert to 24 bit image LLPointer<LLImageRaw> compacted_image = new LLImageRaw(raw_image->getWidth(), raw_image->getHeight(), 3); compacted_image->copy(raw_image); raw_image->resize(raw_image->getWidth(), raw_image->getHeight(), 3); raw_image->copy(compacted_image); } } if( success && flipped ) { // This works because the Targa definition requires that RLE blocks never // encode pixels from more than one scanline. // (On the other hand, it's not as fast as writing separate flipped versions as // we did with TruecolorNonRle.) raw_image->verticalFlip(); } return success; } BOOL LLImageTGA::decodeTruecolorNonRle( LLImageRaw* raw_image, BOOL &alpha_opaque ) { alpha_opaque = TRUE; // Origin is the bottom left U8* dst = raw_image->getData(); U8* src = getData() + mDataOffset; S32 pixels = getWidth() * getHeight(); if (getComponents() == 4) { while( pixels-- ) { // Our data is stored in RGBA. TGA stores them as BGRA (little-endian ARGB) dst[0] = src[2]; // Red dst[1] = src[1]; // Green dst[2] = src[0]; // Blue dst[3] = src[3]; // Alpha if (dst[3] != 255) { alpha_opaque = FALSE; } dst += 4; src += 4; } } else if (getComponents() == 3) { if( mIs15Bit ) { while( pixels-- ) { decodeTruecolorPixel15( dst, src ); dst += 3; src += 2; } } else { while( pixels-- ) { dst[0] = src[2]; // Red dst[1] = src[1]; // Green dst[2] = src[0]; // Blue dst += 3; src += 3; } } } else if (getComponents() == 1) { memcpy(dst, src, pixels); /* Flawfinder: ignore */ } return TRUE; } void LLImageTGA::decodeColorMapPixel8( U8* dst, const U8* src ) { S32 index = llclamp( *src - mColorMapStart, 0, mColorMapLength - 1 ); dst[0] = mColorMap[ index ]; } void LLImageTGA::decodeColorMapPixel15( U8* dst, const U8* src ) { S32 index = llclamp( *src - mColorMapStart, 0, mColorMapLength - 1 ); decodeTruecolorPixel15( dst, mColorMap + 2 * index ); } void LLImageTGA::decodeColorMapPixel24( U8* dst, const U8* src ) { S32 index = 3 * llclamp( *src - mColorMapStart, 0, mColorMapLength - 1 ); dst[0] = mColorMap[ index + 2 ]; // Red dst[1] = mColorMap[ index + 1 ]; // Green dst[2] = mColorMap[ index + 0 ]; // Blue } void LLImageTGA::decodeColorMapPixel32( U8* dst, const U8* src ) { S32 index = 4 * llclamp( *src - mColorMapStart, 0, mColorMapLength - 1 ); dst[0] = mColorMap[ index + 2 ]; // Red dst[1] = mColorMap[ index + 1 ]; // Green dst[2] = mColorMap[ index + 0 ]; // Blue dst[3] = mColorMap[ index + 3 ]; // Alpha } BOOL LLImageTGA::decodeColorMap( LLImageRaw* raw_image, BOOL rle, BOOL flipped ) { // If flipped, origin is the top left. Need to reverse the order of the rows. // Otherwise the origin is the bottom left. if( 8 != mPixelSize ) { return FALSE; } U8* src = getData() + mDataOffset; U8* dst = raw_image->getData(); // start from the top void (LLImageTGA::*pixel_decoder)( U8*, const U8* ); switch( mColorMapBytesPerEntry ) { case 1: pixel_decoder = &LLImageTGA::decodeColorMapPixel8; break; case 2: pixel_decoder = &LLImageTGA::decodeColorMapPixel15; break; case 3: pixel_decoder = &LLImageTGA::decodeColorMapPixel24; break; case 4: pixel_decoder = &LLImageTGA::decodeColorMapPixel32; break; default: llassert(0); return FALSE; } if( rle ) { U8* last_dst = dst + getComponents() * (getHeight() * getWidth() - 1); while( dst <= last_dst ) { // Read RLE block header U8 block_header_byte = *src; src++; U8 block_pixel_count = (block_header_byte & 0x7F) + 1; if( block_header_byte & 0x80 ) { // Encoded (duplicate-pixel) block do { (this->*pixel_decoder)( dst, src ); dst += getComponents(); block_pixel_count--; } while( block_pixel_count > 0 ); src++; } else { // Unencoded block do { (this->*pixel_decoder)( dst, src ); dst += getComponents(); src++; block_pixel_count--; } while( block_pixel_count > 0 ); } } raw_image->verticalFlip(); } else { S32 src_row_bytes = getWidth(); S32 dst_row_bytes = getWidth() * getComponents(); if( flipped ) { U8* src_last_row_start = src + (getHeight() - 1) * src_row_bytes; src = src_last_row_start; // start from the bottom src_row_bytes *= -1; } S32 i; S32 j; for( S32 row = 0; row < getHeight(); row++ ) { for( i = 0, j = 0; j < getWidth(); i += getComponents(), j++ ) { (this->*pixel_decoder)( dst + i, src + j ); } dst += dst_row_bytes; src += src_row_bytes; } } return TRUE; } BOOL LLImageTGA::encode(const LLImageRaw* raw_image, F32 encode_time) { llassert_always(raw_image); deleteData(); setSize(raw_image->getWidth(), raw_image->getHeight(), raw_image->getComponents()); // Data from header mIDLength = 0; // Length of identifier string mColorMapType = 0; // 0 = No Map // Supported: 2 = Uncompressed true color, 3 = uncompressed monochrome without colormap switch( getComponents() ) { case 1: mImageType = 3; break; case 2: // Interpret as intensity plus alpha case 3: case 4: mImageType = 2; break; default: return FALSE; } // Color map stuff (unsupported) mColorMapIndexLo = 0; // First color map entry (low order byte) mColorMapIndexHi = 0; // First color map entry (high order byte) mColorMapLengthLo = 0; // Color map length (low order byte) mColorMapLengthHi = 0; // Color map length (high order byte) mColorMapDepth = 0; // Size of color map entry (15, 16, 24, or 32 bits) // Image offset relative to origin. mXOffsetLo = 0; // X offset from origin (low order byte) mXOffsetHi = 0; // X offset from origin (hi order byte) mYOffsetLo = 0; // Y offset from origin (low order byte) mYOffsetHi = 0; // Y offset from origin (hi order byte) // Height and width mWidthLo = U8(getWidth() & 0xFF); // Width (low order byte) mWidthHi = U8((getWidth() >> 8) & 0xFF); // Width (hi order byte) mHeightLo = U8(getHeight() & 0xFF); // Height (low order byte) mHeightHi = U8((getHeight() >> 8) & 0xFF); // Height (hi order byte) S32 bytes_per_pixel; switch( getComponents() ) { case 1: bytes_per_pixel = 1; break; case 3: bytes_per_pixel = 3; break; case 2: // Interpret as intensity plus alpha. Store as RGBA. case 4: bytes_per_pixel = 4; break; default: return FALSE; } mPixelSize = U8(bytes_per_pixel * 8); // 8, 16, 24, 32 bits per pixel mAttributeBits = (4 == bytes_per_pixel) ? 8 : 0; // 4 bits: number of attribute bits (alpha) per pixel mOriginRightBit = 0; // 1 bit: origin, 0 = left, 1 = right mOriginTopBit = 0; // 1 bit: origin, 0 = bottom, 1 = top mInterleave = 0; // 2 bits: interleaved flag, 0 = none, 1 = interleaved 2, 2 = interleaved 4 const S32 TGA_HEADER_SIZE = 18; const S32 COLOR_MAP_SIZE = 0; mDataOffset = TGA_HEADER_SIZE + mIDLength + COLOR_MAP_SIZE; // Offset from start of data to the actual header. S32 pixels = getWidth() * getHeight(); S32 datasize = mDataOffset + bytes_per_pixel * pixels; U8* dst = allocateData(datasize); // Write header *(dst++) = mIDLength; *(dst++) = mColorMapType; *(dst++) = mImageType; *(dst++) = mColorMapIndexLo; *(dst++) = mColorMapIndexHi; *(dst++) = mColorMapLengthLo; *(dst++) = mColorMapLengthHi; *(dst++) = mColorMapDepth; *(dst++) = mXOffsetLo; *(dst++) = mXOffsetHi; *(dst++) = mYOffsetLo; *(dst++) = mYOffsetHi; *(dst++) = mWidthLo; *(dst++) = mWidthHi; *(dst++) = mHeightLo; *(dst++) = mHeightHi; *(dst++) = mPixelSize; *(dst++) = ((mInterleave & 3) << 5) | ((mOriginTopBit & 1) << 4) | ((mOriginRightBit & 1) << 3) | ((mAttributeBits & 0xF) << 0); // Write pixels const U8* src = raw_image->getData(); llassert( dst == getData() + mDataOffset ); S32 i = 0; S32 j = 0; switch( getComponents() ) { case 1: memcpy( dst, src, bytes_per_pixel * pixels ); /* Flawfinder: ignore */ break; case 2: while( pixels-- ) { dst[i + 0] = src[j + 0]; // intensity dst[i + 1] = src[j + 0]; // intensity dst[i + 2] = src[j + 0]; // intensity dst[i + 3] = src[j + 1]; // alpha i += 4; j += 2; } break; case 3: while( pixels-- ) { dst[i + 0] = src[i + 2]; // blue dst[i + 1] = src[i + 1]; // green dst[i + 2] = src[i + 0]; // red i += 3; } break; case 4: while( pixels-- ) { dst[i + 0] = src[i + 2]; // blue dst[i + 1] = src[i + 1]; // green dst[i + 2] = src[i + 0]; // red dst[i + 3] = src[i + 3]; // alpha i += 4; } break; } return TRUE; } BOOL LLImageTGA::decodeTruecolorRle32( LLImageRaw* raw_image, BOOL &alpha_opaque ) { llassert( getComponents() == 4 ); alpha_opaque = TRUE; U8* dst = raw_image->getData(); U32* dst_pixels = (U32*) dst; U8* src = getData() + mDataOffset; U8* last_src = src + getDataSize(); U32 rgba; U8* rgba_byte_p = (U8*) &rgba; U32* last_dst_pixel = dst_pixels + getHeight() * getWidth() - 1; while( dst_pixels <= last_dst_pixel ) { // Read RLE block header if (src >= last_src) return FALSE; U8 block_header_byte = *src; src++; U32 block_pixel_count = (block_header_byte & 0x7F) + 1; if( block_header_byte & 0x80 ) { // Encoded (duplicate-pixel) block if (src + 3 >= last_src) return FALSE; rgba_byte_p[0] = src[2]; rgba_byte_p[1] = src[1]; rgba_byte_p[2] = src[0]; rgba_byte_p[3] = src[3]; if (rgba_byte_p[3] != 255) { alpha_opaque = FALSE; } src += 4; register U32 value = rgba; do { *dst_pixels = value; dst_pixels++; block_pixel_count--; } while( block_pixel_count > 0 ); } else { // Unencoded block do { if (src + 3 >= last_src) return FALSE; ((U8*)dst_pixels)[0] = src[2]; ((U8*)dst_pixels)[1] = src[1]; ((U8*)dst_pixels)[2] = src[0]; ((U8*)dst_pixels)[3] = src[3]; if (src[3] != 255) { alpha_opaque = FALSE; } src += 4; dst_pixels++; block_pixel_count--; } while( block_pixel_count > 0 ); } } return TRUE; } BOOL LLImageTGA::decodeTruecolorRle15( LLImageRaw* raw_image ) { llassert( getComponents() == 3 ); llassert( mIs15Bit ); U8* dst = raw_image->getData(); U8* src = getData() + mDataOffset; U8* last_src = src + getDataSize(); U8* last_dst = dst + getComponents() * (getHeight() * getWidth() - 1); while( dst <= last_dst ) { // Read RLE block header if (src >= last_src) return FALSE; U8 block_header_byte = *src; src++; U8 block_pixel_count = (block_header_byte & 0x7F) + 1; if( block_header_byte & 0x80 ) { // Encoded (duplicate-pixel) block do { if (src + 2 >= last_src) return FALSE; decodeTruecolorPixel15( dst, src ); // slow dst += 3; block_pixel_count--; } while( block_pixel_count > 0 ); src += 2; } else { // Unencoded block do { if (src + 2 >= last_src) return FALSE; decodeTruecolorPixel15( dst, src ); dst += 3; src += 2; block_pixel_count--; } while( block_pixel_count > 0 ); } } return TRUE; } BOOL LLImageTGA::decodeTruecolorRle24( LLImageRaw* raw_image ) { llassert( getComponents() == 3 ); U8* dst = raw_image->getData(); U8* src = getData() + mDataOffset; U8* last_src = src + getDataSize(); U8* last_dst = dst + getComponents() * (getHeight() * getWidth() - 1); while( dst <= last_dst ) { // Read RLE block header if (src >= last_src) return FALSE; U8 block_header_byte = *src; src++; U8 block_pixel_count = (block_header_byte & 0x7F) + 1; if( block_header_byte & 0x80 ) { // Encoded (duplicate-pixel) block do { if (src + 2 >= last_src) return FALSE; dst[0] = src[2]; dst[1] = src[1]; dst[2] = src[0]; dst += 3; block_pixel_count--; } while( block_pixel_count > 0 ); src += 3; } else { // Unencoded block do { if (src + 2 >= last_src) return FALSE; dst[0] = src[2]; dst[1] = src[1]; dst[2] = src[0]; dst += 3; src += 3; block_pixel_count--; } while( block_pixel_count > 0 ); } } return TRUE; } BOOL LLImageTGA::decodeTruecolorRle8( LLImageRaw* raw_image ) { llassert( getComponents() == 1 ); U8* dst = raw_image->getData(); U8* src = getData() + mDataOffset; U8* last_src = src + getDataSize(); U8* last_dst = dst + getHeight() * getWidth() - 1; while( dst <= last_dst ) { // Read RLE block header if (src >= last_src) return FALSE; U8 block_header_byte = *src; src++; U8 block_pixel_count = (block_header_byte & 0x7F) + 1; if( block_header_byte & 0x80 ) { if (src >= last_src) return FALSE; // Encoded (duplicate-pixel) block memset( dst, *src, block_pixel_count ); dst += block_pixel_count; src++; } else { // Unencoded block do { if (src >= last_src) return FALSE; *dst = *src; dst++; src++; block_pixel_count--; } while( block_pixel_count > 0 ); } } return TRUE; } // Decoded and process the image for use in avatar gradient masks. // Processing happens during the decode for speed. BOOL LLImageTGA::decodeAndProcess( LLImageRaw* raw_image, F32 domain, F32 weight ) { llassert_always(raw_image); // "Domain" isn't really the right word. It refers to the width of the // ramp portion of the function that relates input and output pixel values. // A domain of 0 gives a step function. // // | /---------------- // O| / | // u| / | // t| / | // p|------------------/ | // u| | | // t|<---------------->|<-->| // | "offset" "domain" // | // --+---Input-------------------------------- // | if (!getData() || (0 == getDataSize())) { setLastError("LLImageTGA trying to decode an image with no data!"); return FALSE; } // Only works for unflipped monochrome RLE images if( (getComponents() != 1) || (mImageType != 11) || mOriginTopBit || mOriginRightBit ) { llerrs << "LLImageTGA trying to alpha-gradient process an image that's not a standard RLE, one component image" << llendl; return FALSE; } raw_image->resize(getWidth(), getHeight(), getComponents()); U8* dst = raw_image->getData(); U8* src = getData() + mDataOffset; U8* last_dst = dst + getHeight() * getWidth() - 1; if( domain > 0 ) { // Process using a look-up table (lut) const S32 LUT_LEN = 256; U8 lut[LUT_LEN]; S32 i; F32 scale = 1.f / domain; F32 offset = (1.f - domain) * llclampf( 1.f - weight ); F32 bias = -(scale * offset); for( i = 0; i < LUT_LEN; i++ ) { lut[i] = (U8)llclampb( 255.f * ( i/255.f * scale + bias ) ); } while( dst <= last_dst ) { // Read RLE block header U8 block_header_byte = *src; src++; U8 block_pixel_count = (block_header_byte & 0x7F) + 1; if( block_header_byte & 0x80 ) { // Encoded (duplicate-pixel) block memset( dst, lut[ *src ], block_pixel_count ); dst += block_pixel_count; src++; } else { // Unencoded block do { *dst = lut[ *src ]; dst++; src++; block_pixel_count--; } while( block_pixel_count > 0 ); } } } else { // Process using a simple comparison agains a threshold const U8 threshold = (U8)(0xFF * llclampf( 1.f - weight )); while( dst <= last_dst ) { // Read RLE block header U8 block_header_byte = *src; src++; U8 block_pixel_count = (block_header_byte & 0x7F) + 1; if( block_header_byte & 0x80 ) { // Encoded (duplicate-pixel) block memset( dst, ((*src >= threshold) ? 0xFF : 0), block_pixel_count ); dst += block_pixel_count; src++; } else { // Unencoded block do { *dst = (*src >= threshold) ? 0xFF : 0; dst++; src++; block_pixel_count--; } while( block_pixel_count > 0 ); } } } return TRUE; } // Reads a .tga file and creates an LLImageTGA with its data. bool LLImageTGA::loadFile( const std::string& path ) { S32 len = path.size(); if( len < 5 ) { return false; } std::string extension = gDirUtilp->getExtension(path); if( "tga" != extension ) { return false; } LLFILE* file = LLFile::fopen(path, "rb"); /* Flawfinder: ignore */ if( !file ) { llwarns << "Couldn't open file " << path << llendl; return false; } S32 file_size = 0; if (!fseek(file, 0, SEEK_END)) { file_size = ftell(file); fseek(file, 0, SEEK_SET); } U8* buffer = allocateData(file_size); S32 bytes_read = fread(buffer, 1, file_size, file); if( bytes_read != file_size ) { deleteData(); llwarns << "Couldn't read file " << path << llendl; return false; } fclose( file ); if( !updateData() ) { llwarns << "Couldn't decode file " << path << llendl; deleteData(); return false; } return true; }